[MrGannondorf]

From what I've seen, it looks like you're just recoloring stuff... wich isn't a bad thing to do, because they managed to break backpals, and wont even add them in v3.

With that aside, the first picture looks very dessolate, and has a bit of a dusty/dirty feel... great for a desert, but autumn has a bit more life in it than that. Add a bit more green, red, and yellow. The grass should still be slightly green, or patchy green, as its not quite dead yet.

My sugestion for the winder backpal is not to recolor stuff, because that just looks like perma frost. Try to make it so snow has fallen on the objects. I sugest you take the existing winter objects and paste them over the 'summery' ones, and then edit that for the sake of creativity.